163655431 has 2 divisors, whose sum is σ = 163655432. Its totient is φ = 163655430.

The previous prime is 163655399. The next prime is 163655449. The reversal of 163655431 is 134556361.

It is a strong prime.

It is an emirp because it is prime and its reverse (134556361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163655431 - 2⁵ = 163655399 is a prime.

It is a super-2 number, since 2×163655431² = 53566200191591522, which contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81827715 + 81827716.

It is an arithmetic number, because the mean of its divisors is an integer number (81827716).

Almost surely, 2^163655431 is an apocalyptic number.

163655431 is a deficient number, since it is larger than the sum of its proper divisors (1).

163655431 is an equidigital number, since it uses as much as digits as its factorization.

163655431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 163655431 is about 12792.7882418181. The cubic root of 163655431 is about 546.9867514145.

The spelling of 163655431 in words is "one hundred sixty-three million, six hundred fifty-five thousand, four hundred thirty-one".